Method of constructing containers



, W. H. KEMPTON. METHGD OF CONSTRUCTING CONTAINERS. APPLICATION men AUGJO, 1916'.

1 32,045. Patented Feb. 24, 1920.

lilili all/II ITNESSES: INVENTOR (96672. a 1 42%. 4/ ATTORNEY WILLARD KEMPTON, OFWILKINSBURG, PENNSYLVANIA, ASSIGNOR T0 WESTING- HOUSE ELECTRIC MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VAN IA.

METHOD OF CONSTRUCTING CONTAINERS.

Specification of Letters Patent.

Patented Feb. 24, 1920.

Application filed August 10, 1918. Serial No. 249,347.

To all whom it may concern:

Be it known that I, WILLARD H. KEMP TON, a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Methods of Constructing Containers, of which the following is a specification. My invention relates to containers and more particularly to dash-pot casings, and it has for its primary object the construction of a dash-pot casing, comprising superimposed layers of impregnated sheet material, by molding a cured bottom into an uncured tube composed of the same material as the bottom.

One object of my invention is to construct a container which shall be mechanically strong and which will be unaffected by wide temperature changes, moisture, oils, weak acids and alkalis.

Another object of my invention is to construct containers by a method which will permit accurate predetermination of the dimensions. desired.

i A further object of my invention is to construct a container in which a smooth hard surface may be obtained without further work than that required in the natural course of constructing the container.

A still further object of my invention is to construct a container or dash-pot casing whose surfaces shall have desirable selflubricating qualities.

A still further object of myinvention is the manufacture of dash-pot casings by separately preforming cured and uncured portions constituting the body and then molding the portions together in such manner that a strong, air-tight joint may be obtained. Y

With these and other objectsjin view, my invention will be more fully described; illustrated in the drawings. in the several views of which corresponding numerals in dicate like parts, and then particularly pointed out in the appended claims.

Referring to the drawings, Figure 1 is a diametrical, sectional view of a dash-pot casing embodying my invention, showing mandrels employed in constructing the easing; Fig. 2' is a vertical, transverse sectional view of a mold which may be employed in treating containers constructed in accordance with my invention, a container being shown, in section, inclosed in the mold, and Fig. 3 is a central longitudinal, sectional view of the mold and container shown in Fig. 2.

In practising my invention, I may construct a container or dash-pot casing by first preforming and curing a disk which may be subsequently utilized as a bottom for the container. The disk may be placed between two mandrels of less diameter than the disk and impregnated sheet material may be wound about the disk and the mandrels to form a tube inclosing them. The body thus assembled may then be placed in a suitable mold and subjected to heat and pressure to compact the material forming the tube and harden the binder with which it is impregnated.

In Fig. 1 is shown, diagrammatically, a dash-pot casing 1 formed preparatory to molding. The material employed may be a fibrous sheet material such as duck, paper, or loosely matted fibrous material, such as cotton batting. the material employed being governed by the nature of the finished product desired. For instance, if paper is employed, a product having relatively great tensile strength may be obtained, whereas, if duck is employed a product having less tensile strength but greater resiliency will be obtained. The binder employed may be a phenolic condensation product, such as bakelite. The preformed and cured disk 2 is made of impregnated sheet material by stacking the impregnated sheet material and subjecting it to heat and pressure after which the disk 2 may be cut from the stacked and compressed material or the impregnated sheet material may be cut to shape before it is stacked and pressed. In either event, heat and pressure. sufiicient to first soften and compact the material and to then permanently harden the binder, should be employed.

The disk 2. after being cured, may be disposed between two mandr ls 3 and 4, of less diameter than the disk 2. so that the disk projects bevond the mandrels. The mandrels 3 and 4 will also be of di ferent lengths so that a tube 5, which is formed about them, may have chambers 6 and 7, of different lengths. on the respective sides of the disk 2. A material 8, similar to that employed in constructing theidisk, maybe impregnated with a suitable binder, such as a phenolic condensation product, and wound about the mandrels 3 ands and the disk Qbetwen 't'liemuntila suitable thick-" 8 or the graphite may be rubbed or dusted on the material 8 after it is impregnated and previous to winding it about the man drels 3 and A. i r

l V and 12.

The material that bulges over, the disk 2,

when itis wound about the mandrels 3 and A and the disk 2 is compressed, when su-bjected to heat and pressure in a mold,-and

engages the disk in such manner that a mechanically strong and air-tight joint vis obtained." This is partially "due to the nature of the binder which, when heated, tends to flow into any openin'gs which have beenformed in constructing the body and partially to the compressibility of the sheet materal;

The mold 9 shown in Fig. 2 is of standard construction and is shown only to illustrate the method ofconstructing ,myimproved casing. The container 1 may be preformed, as shown in Fig. l, and the splits 10 of the mold 9 assembled about it. The splits 10 and the casing 1 may then be placed between the wedges 11 and 12 which are supported by the bottom clamping plate 13; the wall 1 of the mold 1, which also restsupon'the bottom clamping plate 13, incloses the entire structure. The top clamping plate 15 may then be placed on the splits 1G and pressure applied to force the casing 1 and the splits l0 surrounding it down into the mold 9. Pres- S'llrethus brought to bear upon all sides of the casing 1 through the action of the splits 10 in conjunction with the wedges 11 Heat may be applied during the operation to softenlthe binder and then to harden it.

Casings formed in the manner disclosed are very strong mechanically because of their laminated structure and the character of the binder employed. Furthermore, if care is takento insure a coating of binder on the exterior of the material after it is molded, self-lubricating qualities, which un ider ordinary conditions, will be sufficient,

may be obtained without the addition of graphite or-srmilar lubricant. 1; container constructed inaccordance with my invention material employed in forming containersin accordance with my invention may easily handled, as the sheet material maybe impregnated with the binder and then dried, the binder subsequently becoming active upon the application of further heat and pressure.

It will be apparent that a container may be constructed, in the mannerv disclosed herein, by utilizing different material in forming the bottom'tha'n that employed In forming the tube and the same result obtained if both materials have substantially the same coefficient of expansion.

Although I have described and illustrated only one form'of container, it is obvious that minor changes may bemade in constructing containers without departing fromthe spirit of my invention and I desire, therefore, that no limitationsshall be imposedexcept such as are. indicated in the appended claims I claimas my invention:

1. A method of ,constructing containers that comprises molding a disk of impregnated fibrous material, disposing 'mandrels on opposite sides of the disk, the mandrels being of less diameter than the disk, win-ding impregnated sheet material about the mandrels and disk and subjecting the-assembled structure torheat and pressure in a mold. v V 2. A method of constructing'containers that comprises forming a disk of fibrous sheet material I impregnated with a. phenolic condensation product, disposing mandrels on opposite sides of the disk, the mandrels being of less diameter than the disk, winding fibrous sheet material impregnated with r a phenolic condensation product about the 'mandrels and disk and subjecting the, as-

sembledstructure to heat and pressure in a mold I 8. A method of 'con'structin'g. containers that comprises molding a disk-of impregnated sheet material within a'tubu'lar'body of similar material. 7 v

i. A method of constructing; containers that comprises molding a disk of sheet material impregnated with a phenolic condensation product within a tubular body of similar material.

5. A method of constructing containers that comprises molding a disk of sheet material impregnated with a phenolic condensation product within a tubular body of similar material and embedding the disk in th e wall of the tubular body.

6. A method of constructingcontainers 1 that comprises molding a disk of sheet ma:-

terial impregnated with a phenolicgcondensation product'a'nd molding tubular body of. like; material-about it under such pressure as to form the edge of the disk into the wall of the body.

7. A method of constructing containers that comprises molding a bottom into a tubular body comprising superimposed layers of fibrous material impre nated with a binder adapted to harden under the application of heat and pressure.

8. A method of constructing containers that comprises molding a bottom into a body comprising superimposed layers of sheet material impregnated with a binder adapted to harden under the application of heat and pressure.

9. A method of constructing containers 15 In testimony whereof, I have hereunto 20 subscribed my name this 7th day of August 1918.

WILLARD H. KEMPTON. 

